GB1281934A - Arangement for voice-frequency signalling, e.g. for a telephone system - Google Patents
Arangement for voice-frequency signalling, e.g. for a telephone systemInfo
- Publication number
- GB1281934A GB1281934A GB54083/69A GB5408369A GB1281934A GB 1281934 A GB1281934 A GB 1281934A GB 54083/69 A GB54083/69 A GB 54083/69A GB 5408369 A GB5408369 A GB 5408369A GB 1281934 A GB1281934 A GB 1281934A
- Authority
- GB
- United Kingdom
- Prior art keywords
- line
- sub
- signals
- relay
- relays
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000011664 signaling Effects 0.000 title abstract 4
- 239000003550 marker Substances 0.000 abstract 3
- 238000004804 winding Methods 0.000 abstract 2
- 230000000903 blocking effect Effects 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 abstract 1
- 230000015556 catabolic process Effects 0.000 abstract 1
- 230000003111 delayed effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/30—Devices which can set up and transmit only one digit at a time
- H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/0004—Selecting arrangements using crossbar selectors in the switching stages
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Telephonic Communication Services (AREA)
- Devices For Supply Of Signal Current (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE15002/68A SE331496B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1968-11-05 | 1968-11-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1281934A true GB1281934A (en) | 1972-07-19 |
Family
ID=20299990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB54083/69A Expired GB1281934A (en) | 1968-11-05 | 1969-11-04 | Arangement for voice-frequency signalling, e.g. for a telephone system |
Country Status (8)
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2162898A1 (de) * | 1971-06-22 | 1972-12-28 | Sits Soc It Telecom Siemens | Schaltungsanordnung zum Identifizieren von Gleichstromsignalen in einer Fernsprechanlage mit Tastenwahl |
| JPS5012913A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1973-06-04 | 1975-02-10 |
-
1968
- 1968-11-05 SE SE15002/68A patent/SE331496B/xx unknown
-
1969
- 1969-10-10 US US865279A patent/US3636269A/en not_active Expired - Lifetime
- 1969-10-20 NO NO4160/69A patent/NO125210B/no unknown
- 1969-10-22 DE DE1954057A patent/DE1954057C3/de not_active Expired
- 1969-11-04 GB GB54083/69A patent/GB1281934A/en not_active Expired
- 1969-11-05 FR FR6938119A patent/FR2022652A1/fr not_active Withdrawn
- 1969-11-05 BE BE741286D patent/BE741286A/xx unknown
- 1969-11-05 NL NL6916697A patent/NL6916697A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| US3636269A (en) | 1972-01-18 |
| DE1954057A1 (de) | 1970-06-18 |
| BE741286A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1970-04-16 |
| NL6916697A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1970-05-08 |
| DE1954057C3 (de) | 1975-06-26 |
| SE331496B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1971-01-04 |
| DE1954057B2 (de) | 1974-11-07 |
| NO125210B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1972-07-31 |
| FR2022652A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1970-07-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |